void main() {
  String username = "张三";
  print(username);
  username = "flutter真好学";
  print(username);

  // 前端和鸿蒙字符串 `${username}`
  // flutter不要反引号
  print('当前的用户名:$username');
  print('当前的用户名的长度:${username.length * 10}');

  // 使用\n换行符
  String poemStr = '白日依山尽\n黄河入海流\n欲穷千里目\n更上一层楼';
  print(poemStr);

  // 还有一种换行模式
  String song = '''
    Hiding from rain and snow,
    Looking at crowed from our around go
''';
  print(song);
}
